2025 CHEVROLET SUBURBAN 1500

FORWARD COLLISION AVOIDANCE: WARNINGS

My Onstar system is not working properly. I first noticed the Forward Collision light then the Wifi hotspot features not working. Reached out to onstar they couldn’t help then referred to dealership. Visited dealership 8/12/2025 was told there’s no error code although they see what’s happening. Doing further investigation of my own i found out this is a very well known issue amongst General Motors, Onstar and the dealerships selling these vehicles. There are varying issues customers are having from wifi not working to vehicles completely shutting down in traffic. Once my visit to the dealership commenced i was informed the Telematic Control Module” is on back order with no estimate on deliveries as there’s “others waiting also” this is a scary situation. I am worried that my issue is going to progress into a bigger problem. I drive 23 miles to work and 23 back. I am scared that my module will eventually fail when i am on the highway…..this is terrifying! Over 80k to play roulette.

UNKNOWN OR OTHER

My Onstar system is not working properly. I first noticed the Forward Collision light then the Wifi hotspot features not working. Reached out to onstar they couldn’t help then referred to dealership. Visited dealership 8/12/2025 was told there’s no error code although they see what’s happening. Doing further investigation of my own i found out this is a very well known issue amongst General Motors, Onstar and the dealerships selling these vehicles. There are varying issues customers are having from wifi not working to vehicles completely shutting down in traffic. Once my visit to the dealership commenced i was informed the Telematic Control Module” is on back order with no estimate on deliveries as there’s “others waiting also” this is a scary situation. I am worried that my issue is going to progress into a bigger problem. I drive 23 miles to work and 23 back. I am scared that my module will eventually fail when i am on the highway…..this is terrifying! Over 80k to play roulette.

FORWARD COLLISION AVOIDANCE: ADAPTIVE CRUISE CONTROL

The contact owns a 2025 Chevrolet Suburban. The contact stated that the "Adaptive Cruise Control Temporarily Unavailable" message was displayed on the instrument panel. The vehicle was taken to a local dealer where the vehicle was diagnosed, and the contact was advised that the radar was faulty and needed to be replaced. The vehicle was not repaired. The manufacturer was notified of the failure. The approximate failure mileage was 23,686.

ENGINE

The engine in 2025 Suburban (6.2L V8) has failed and the car is not drivable. It is currently in a Chevy dealership service department waiting for parts. The 2025 model is not listed under the recall. However it should be, I know of 3 2025 engines that have recently failed. I was passing a vehicle and as I took my foot off the accelerator the transmission shifted 2 times and then the engine shut off and the car was coasting. We had no indication that the engine shut off, just several messages on the screen. ( Press start button, and conditions not correct for shifting.)

UNKNOWN OR OTHER

Still, I don’t have a registration

SERVICE BRAKES

The brake system had a failure and the vehicle could not be slowed down. The brakes would come and go until I was able to stop. GM dealership diagnosed it with a failed master cylinder and the part is on national back order.

ELECTRICAL SYSTEM

Main display, driver display, and HUD froze while driving. Speedometer froze as well. Main display goes back while the driver display freezes. NO blinkers worked. This happened 3x throughout the day. Only way to reset is unhooking the battery.

EXTERIOR LIGHTING

OnStar Module factory defaults/Malfunctioning - Power button don’t turn on so there’s no internet connection. This effect all the safety features in the car. Please recall. There has been numerous incidents reported online to this particular default.

ELECTRICAL SYSTEM

OnStar Module factory defaults/Malfunctioning - Power button don’t turn on so there’s no internet connection. This effect all the safety features in the car. Please recall. There has been numerous incidents reported online to this particular default.